Endress+Hauser Analytik Jena Multi X 2500, Руководство по эксплуатации

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AOX determination multi X 2500
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As an alternative to the membrane filtration, the separation of water/activated carbon
or water/activated carbon/sludge can be effected using the automatic filtration unit
AFU 3. For this process, the activated carbon or the mixture of activated carbon and
sludge is pressed into a frit container (18 x 8 mm) using overpressure of up to 2 bar.
The samples can then be combusted and analyzed in vertical operating mode (with
open combustion tube).
6.1.2 Sample preparation for AOX determination from sludge and sediments
Enrichment and filtration are generally effected as described for the batch method (
→
"Sample preparation for AOX determination from waters", p. 52). Depending on the
expected AOX content, add 10 to 100 mg of the sample (e.g. sewage sludge) and
approximately 20 mg of AOX carbon to a 25-ml Erlenmeyer flask containing 10 ml of
nitrate stock solution and shake the mixture for 1 hour. After that, the samples are
filtered using a membrane filtration apparatus or the AFU 3, washed with nitrate wash
solution and combusted.
6.2 AOX determination in vertical operating mode (recommended)
Sample preparation Column and batch method
Operating mode: Vertical:
Measuring cell "sensitive"
Measuring range 1 to 100 µg Cl
Electrolyte volume 15 to 20 ml
Combustion tube Open combustion tube
with pre-combustion adapter (batch method) as an option
manual sample
introduction
Without accessories
automatic sample
introduction
One of the following samplers:
autoX 36 (for column method or batch method)
autoX 36d (column method)
autoX 112 with AOX rack (column method)
For AOX determination in vertical operating mode the analyzer is operated using the
default configuration. It is equipped with the open combustion tube and the measuring
cell "sensitive".
There is the option to equip the analyzer with a pre-combustion adapter for analyzing
sewage sludge and sediments.
When using the autosampler autoX 112, observe the particular instructions in the
respective user manual!
AFU 3